37 + (19 + 11) =, 47, 57, 77, 67, 42 – (55 – 26) =, 14, 23, 13, 17, 15 + (8 + 7) =, 20, 35, 30, 25, 50 – (30 – 10) =, 50, 20, 40, 30, 28 + (12 + 5) =, 40, 50, 45, 35, 60 – (20 + 15) =, 25, 35, 45, 15, 18 + (22 – 10) =, 50, 40, 20, 30, 90 – (45 + 10) =, 35, 25, 45, 55, 25 + (15 + 10) =, 50, 40, 60, 30, 70 – (30 – 5) =, 45, 35, 65, 55.

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